SirWilliamCrookes, OM, FRS (June 17, 1832 – April 4, 1919) was an English chemist and physicist.
WilliamCrookes was born in London, he was the eldest son of Joseph Crookes, a tailor of north-country origin, by his second wife, Mary Scott.
For many years Crookes conducted laborious experiments on the elements of the rare earths, elements so similar to one another in chemical properties that special methods for their separation had to be devised.
It was invented in 1873 by the chemist SirWilliamCrookes as the by-product of some chemical research.
Crookes incorrectly suggested that the force was due to the pressure of light.
The first experiment to disprove this theory was done by Arthur Schuster in 1876, who observed that there was a force on the glass bulb of the Crookes radiometer that was in the opposite direction to the rotation of the vanes.
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